Safety-lock.



Patented Feb. 6, |900.

J. M. ROBINSDN. SAFETY LOCK. (Anplication filed Ap rrr; *ries JOSEPH M.ROBINSON,

OF NEV YORK, N-. Y.

SAFETY-LOOK.

SPECIFICATION forming part of Letters Patent No. 643,670, dated February6, 1900.

Application filed April 15 1 899.

To all whom it may concern.-

Be it known that I, JOSEPH M. ROBINSON, of the city of NewYoi-lg'borough of Manhattan, in the county and State of New York, haveinvented a new and Improved Safety- Lock, of which the following is afull, clear,

Aa window-cleaning belt or device, the two parts being arranged forinterlocking engagement. l

A further Object of the invention is to provide a lock of the characterdescribed that will be perfectly safe in its operation and one free fromall springs and which when once locked cannot be released without theaid of the person using the device and then only when all weight isremoved from the ropes or other medium employed to attach the device tothe cleaning device in connection with which it is used. l

The invention consists in the novel construction and combination of theseveral parts, as will be hereinafter fully set forth, and pointed outin the claims.

Reference is to be had tothe accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a longitudinal vertical section through the member of thedevice adapted for permanent attachment to a support and likewise avertical section of the support, and also illustrates in dotted linesthe position the other member of the device assumes relative to thelirst-narned member just prior to interlocking. Fig. 2 is a frontelevation of the two members of the device, illustrating the movablemember in its first position relative to the fixed member. Fig. `3 is alongitudinal vertical section through the complete device in lockedposition and likewise a vertical section through the support towhich thede- Serial No. 713,128. (No model.)

vice is applied; and Fig. 4 is a front elevation of the complete device,the two members being in interlocking position.

The device practically consists of a back or keeper plate A and a frontor latch plate B. These plates may be constructed of any suitablematerial andmay be of any necessary dimensions or contour. The front orlatch 6o plate B has two slots 10 and 11 of suitable size for thepurpose, and usually the slots have parallel sides and arelongitudinally produced in said plate B. The latch-plate B alsoterminates at what is normally its lower end in an eye or loop 12; butwhile the longitudinal axis of the eye or loop is preferably parallelwith the corresponding axis of the body of the latch-plate the eye orloop 12 for convenience is carried beyond the plane of 7o the front faceof the latch-plate,` as is shown best in'Fig. 3. The eye or loop 12receives the ropes 13, straps, or their equivalents used to connect thebelt or Window-cleaning device with the latch member of the safetylock.

The back o r keeper plate A is usually provided with an outer inclinedsurface 14 at the top, as is shown in Figs. 1 and 3, and with anaperture 15 near the top and asecond aper- 8o ture 16 near the bottom,while between the two apertures 15 and 16 an outwardly-extending angularor upturned lug 17 is formed. This lug may be secured to the back plateor may constitute an integral portion of the Same..

The back plate is adapted for attachment to awindow-frame O or othersupport through the medium of a shouldered T-headed woodscrew or bolt D,adapted to be passed through 9o the upper aperture 15, and an ordinarywoodscrew D', that is passed through the lower aperture 16. The head 18of the wood-screw stands transversely of the back plate,as shown in Fig.2. The object of the shoulder 19 on 95 the T-headed bolt or wood-screwis not only to press the plate A securely to the support C, but as thesaid shoulder is roughened Where it engages with the plate iteifectually prevents any tendency of movement of the T- roo headed screwor bolt when once securely entered to its proper place. It will beunderstood that a back or keeper plate A is secured to each uprightsection of the window- 2 efiaov frame to Which the safety-lock is to beapplied.

With reference to the operation of the device the keeper-plates A aresecurely and permanently fastened to the Window-frame inclosing thesliding sash in the manner shown and described. A latch -plate B induplicate is attached to the ropes 13, which ropes are secured by meansof a belt to the body of the operator, Who upon stepping upon the outersill and holding the1 latch-plate B in the horizontal position (shown inFig.2) and pressing the latch plate against the keeperplate can forcethe head ot' the T-bolt through the slot lO in the latch-plate. As soonas the latch-plate has passed over the bolt-head the operator will turnthe plate and let it drop to the inclined position, (shown in dottedlines in Fig. 1,) Which-Will bring the latch-plate in such relation tothe keeper-plate that the lug 17 of the keeper-plate will enter the slotl1 in the latch-plate, and as soon as the latchplate is released thelatch-plate Will then automatically settle to its locked position.(Shown plainly in Figs. 3 and 4.)- It Will be observed that by thissimple operation-that is, bringing the latch-plate down from ahorizontaltoaperpendicularposition--the T-head of the bolt D liesstraight across the slot l0, as clearly shown in Fig. 4, and that thelatchplate cannot separate from the keeper-plate until released byareversed movement by the operator, While the upturned lug 17 preventsany lateral movement, and the more Weight that is placed upon the safetyropes the tighter the device is locked. At the same time the operatorcan unlock the device instantly the moment he removes all the Weightfrom the latch-plates and carries the latchplates to their first orhorizontal position.

Having thus described my invention, I claim as new and desire to secureby Letters Patentl. A safety-lock consisting of a keeper-plate havingtwo locking-points at angles to each other, and a latch-plate removablefrom the keeper-plate and provided with openings eX- tending in the samedirection, each opening being arranged to receive a locking-point, asdescribed.

2. A safety-lock comprising a keeper-plate provided with a T projection,the head whereof extends transversely of the plate, and an angle-lug onemember of which extends longitudinally of the plate toward the Tprojection, and a latch-plate independent of the keeper-plate andprovided with longitudinal openings, one opening being adapted toreceive the said T projection, and the other opening being adapted toreceive the shank of the said lug, as described.

3. In a safety-lock, the combination, with a keeper-plate provided withan angle-lug projected from its outer face, and a shouldered T- headedscrew bolt arranged to be passed through the keeper-plate and the headof said bolt to extend transversely across the plate, the shoulder ofthe said T-bolt having a roughened surface adapted for engagement withthe outer face of the keeper-plate, the head member of the said lugextending in direction of the screw-bolt, of a latch-plate independentof the keeper-plate, the said latchplate having longitudinal openingsmade therein, so arranged that one opening is capable of receiving theT-head of the screwbolt and the other opening the said lug, for thepurpose specified.

4. A lock,having alatch-plate and a keeper-l plate, the keeper-platehaving two headed projections, the heads being elongated in directionsat angles to each other, and the latchplate having two openingselongated in like directions and capable respectively of receiving theprojections, the latch-plate being held in position by the heads of theprojections.

JOSEPH M. ROBINSON. Witnesses:

J. FRED. AcKnR, G. B. SALMON.

